Punching element holding and removing means



Match 14, 1961 F. w. FELMET PUNCHING ELEMENT HOLDING AND REMOVING MEANS Filed July 20, 1959 i VENTOR ATTORNEYS United States PatentOfi iC A PUNCHING ELEMENT HOLDING AND REMOVING MEANS Frederick W. Felmet, 540 Delaware Ave., Tonawanda,

N.Y., assignor of one-half to Robert H. King, Pendleton, N-Y- Filed July 20,1959, Ser. No. 828,391

3 Claims. (Cl. 279-83) This invention relates to improvements in means for holding a punching element, such as a punch or a die, in its correct, operative position, and for removing the punching element from such position.

It is some times difiicult to secure a punching element, such as a punch or a die, in correct relation to its holding means or retainer so that it will be in correct position to cooperate with another punching element, and

and it is also dit'rlcult at times to remove such punching element from its holder or retainer. It is consequently an object of this invention to provide means of relatively simple and easily manufactured construction for accomplishing both purposes, mainly of securing and removing the punching element in its holder or retainer.

In the acompanying drawings:

Fig. 1 is a plan view of a punching element and the retaining means hterefor embodying this invention.

Fig. 2 is a sectional elevation thereof on line 2-2, Fi 1.

Tig. 3 is a fragmentary, sectional view, on an enlarged scale, of the punching element removed from its holder or retaining member.

, that when it is desired to remove the die button orother punch element from its aperture, the screw 9 is turned In the accompanying drawings I have illustrated my improvements in conenction with a die button 5 mounted in its operative position in a reatiner or holder 6, but it will be understood that this invention may be used in connection with punches for holding the same in correct position with relation to their cooperating dies. The die button illustrated has a substantially cylindrical exterior and is formed to fit into a cylindrical aperture 7 in its retainer. The particular die button illustrated extends somewhat above the upper surface of the retainer 6 but it will be understood that if desired the upper surface of the die button may be flush with the upper surface of the retainer. The die button has the usual inner surface 8 which is circular in form in the particular construction illustrated by way of example, but the interior of the die button may be of any desired noncircular shape. 1

The holding and removing means for the die button include a screw having a threaded stem' 9 formed to enter into a threaded hole 10 in the retainer adjacent to the aperture for the die button. The screw 9 has the usual head 11 and the retainer is provided with a hole 12 for receiving the head of the screw, preferably concentric with the threaded hole 10. The head of the tance below the upper surface of the retainer 6.

The die button is provided in the side thereof with a recess or notch 15ginto whichthe head of the screw extends. This recess, in the construction shown, has an upper wall 16 and a downwardly sloping lower wall 1 7, and the head of the screw 9 is preferably provided on its lower face with a frusto conical part 18 which is formed to cooperate with the-downwardly sloping parts 17 of the punch element.

As a result of this construction, it will be obvious 3. Structure according'to claim'l, in which said recess w J in a direction to move the'head of the screw against the upper face 16 of the recess in the die button. When it is desired to securely hold the die button in its aper ture, the screw 9 is turned in a direction to move it downwardly, whereupon the frusto conical face 18 of the head will bear against the'downwa-rdly sloping face 17 of the recess and thus produce a wedging action which tends to jam the die button against the cylindrical aperture 7 in the retainer and thus securely lock the die button in the retainer.

When my improvements are used in connection with die buttons for a circular, inner surface 8, the recess 15 may be of annular form extending completely or partially around the periphery of the die button. If, however, the aperture in the die button is of non-circular form, such for example, as square or hexagonal, the die button must be held in a particular position with reference to its axis corresponding to the position of the punch cooperating therewith, and the recess is then made frusto conical so that the head of the screw 9 will fit closely against the ends of the recess 15 to limit the position of the die button as may be required to enable it to cooperate with a non-circular punch.

When my improved holding means are used in connection with a punch, the recess in the punch corresponding to the recess 15 shown will serve the purpose of holding the punch in correct position about its axis to cooperate with a die button of non-circular shape. The screw 9 may also serve to remove the punch from its aperture in the retainer, but in many cases the stripping forces acting on the punch when it is removed from the work are too great to be resisted by the screw 9 and consequently other means for holding the punch in its aperture may be used in addition to the positioning and removing screw 9.

The construction described also has the advantage that when used with a die button having its uppersurface the art within theprinciple and scope of the invention 7 as expressed in the appended claims.

I claim:

1. Structure for'securing and removing a cylindrical body in a retainer for said body having an aperture of a shape corresponding to said body, said structure in-.

eluding a screw having a threaded shanlrand an outwardly extending head, said retainer having a threaded hole therein in such proximity to said aperture that a part of the head of said screw will extend into said: aperture, said body having a recess in the side thereof into whichsaid part of the head of said screw extends, said recess having'upper'and lower walls above and below said screw head with which said screvt head is adapted to engage to aperture. 1 l

2. Structure according to claim 1, in which the lower wall of said recess and the under surface of the head of the screw are inclined to cause the screw whenmoved into its threaded hole to urge said body with a wedging. 1 1" action toward the side of the aperture opposite to that' side which is engaged by the screw head.

Patented IMar. 14, 1961' move said body out of and intosaid References Cited in the file of this patent UNITED STATES PATENTS Williams Aug. 14, 1945 Woerner Dec. 8, 1959 is of a length in a circumferential direction not materially greater than the circumferential length of the part of the screw head which extends into said recess, whereby the screw head locates the position of said body about its axis. i 

